下列物质中①空气；②可口可乐；③铁粉；④高锰酸钾；⑤四氧化三铁；⑥过氧化氢；⑦水；⑧红磷，其中属于单质的是______，属于混合物的是______，属于纯净物的是______，属于化合物的是______，属于氧化物的是______．
铁粉、红磷都是由同种元素组成的纯净物，属于单质．故填：③⑧．
空气、可口可乐都是由多种物质组成的物质，属于混合物．故填：①②．
铁粉、高锰酸钾、四氧化三铁、过氧化氢、水、红磷都是由一种物质组成的物质，属于纯净物．
故填：③④⑤⑥⑦⑧．
高锰酸钾、四氧化三铁、过氧化氢、水都是由不同种元素组成的纯净物，属于化合物．故填：④⑤⑥⑦
四氧化三铁、过氧化氢、水都是由两种元素组成，其中一种元素是氧元素的化合物，属于氧化物．
故填：⑤⑥⑦．
The definition of pop music is always changing. Whatever, the most popular music at the time is called 1 music. 2 the early 1900s in America, the popular music was called Ragtime. People played it on piano and was very fast. Some of the songs had 3 and were easy 4 . Some of the songs were only music but were easy to dance, too. In the 1920s, a style called “crooning” was popular. Men sang it with a very gentle voice. In the 1930s and 1940s, “jazz” became popular. Jazz is often fast and people usually play it with a piano and horns. It wasn’t stopping 5 the 1950s when people created “rock and roll”. Elvis Presley is called the “King of Rock and Roll”. He had many popular songs throughout the years. Rock music changed as the years went 6 . Some different kinds of pop music in the 1960s were called Motown and beach music. In the 1960s, there was also a movement in the United States called the British Invasion. That was when the group The Beatles 7 popular. They were one of the most important 8 in American music history. Today, pop music can be Hip Hop, Rap, R & B, or Country. American young people 9 like listening to pop music. People 10 as Michael Jackson, Madonna and Britney Spears are some of the most well-known singers.
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